scholarly journals Optical properties of strongly correlated systems with spin-density-wave order

2002 ◽  
Vol 66 (13) ◽  
Author(s):  
O. V. Dolgov ◽  
M. L. Kulić
Keyword(s):  
Optical Properties ◽  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Strongly Correlated Systems ◽  
Strongly Correlated ◽  
Correlated Systems

scholarly journals Exploring nonequilibrium phases of photo-doped Mott insulators with generalized Gibbs ensembles

2022 ◽  
Vol 5 (1) ◽  
Author(s):  
Yuta Murakami ◽  
Shintaro Takayoshi ◽  
Tatsuya Kaneko ◽  
Zhiyuan Sun ◽  
Denis Golež ◽  
...  
Keyword(s):  
Density Wave ◽  
Strongly Correlated Systems ◽  
Mott Insulators ◽  
Time Behavior ◽  
Strongly Correlated ◽  
Systematic Analysis ◽  
Correlated Systems ◽  
Long Time ◽  
Nonequilibrium States ◽  
The One

AbstractMany experiments show that strong excitations of correlated quantum materials can cause non-thermal phases without equilibrium analogues. Understanding the origin and properties of these nonequilibrium states has been challenging due to the limitations of theoretical methods for nonequilibrium strongly correlated systems. In this work, we introduce a generalized Gibbs ensemble description that enables a systematic analysis of the long-time behavior of photo-doped states in Mott insulators based on equilibrium methods. We demonstrate the power of the method by mapping out the nonequilibrium phase diagram of the one-dimensional extended Hubbard model, which features η-pairing and charge density wave phases in a wide photo-doping range. We furthermore clarify that the peculiar kinematics of photo-doped carriers, and the interaction between them, play an essential role in the formation of these non-thermal phases. Our results establish a new path for the systematic analysis of nonequilibrium strongly correlated systems.

scholarly journals Direct Visualization of Spatial Inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4

2019 ◽  
Vol 4 (3) ◽  
pp. 77 ◽  
Author(s):  
Gaetano Campi ◽  
Nicola Poccia ◽  
Boby Joseph ◽  
Antonio Bianconi ◽  
Shrawan Mishra ◽  
...  
Keyword(s):  
Phase Separation ◽  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Spatial Inhomogeneity ◽  
Strongly Correlated ◽  
Strongly Correlated Electron ◽  
Scale Free ◽  
Spin Order ◽  
Correlated Electron

In several strongly correlated electron systems, the short range ordering of defects, charge and local lattice distortions are found to show complex inhomogeneous spatial distributions. There is growing evidence that such inhomogeneity plays a fundamental role in unique functionality of quantum complex materials. La1.72Sr0.28NiO4 is a prototypical strongly correlated perovskite showing spin stripes order. In this work we present the spatial distribution of the spin order inhomogeneity by applying micro X-ray diffraction to La1.72Sr0.28NiO4, mapping the spin-density-wave order below the 120 K onset temperature. We find that the spin-density-wave order shows the formation of nanoscale puddles with large spatial fluctuations. The nano-puddle density changes on the microscopic scale forming a multiscale phase separation extending from nanoscale to micron scale with scale-free distribution. Indeed spin-density-wave striped puddles are disconnected by spatial regions with negligible spin-density-wave order. The present work highlights the complex spatial nanoscale phase separation of spin stripes in nickelate perovskites and opens new perspectives of local spin order control by strain.

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